diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9f46c3609..380ef6488 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,23 +26,21 @@ jobs:
         run: |
           cd ..
           rm -rf build
-      - name: Setup python
-        uses: actions/setup-python@v4
-        with:
-          python-version: 3.8
       - name: Install Gusto
         run: |
           . /home/firedrake/firedrake/bin/activate
           python -m pip install -r requirements.txt
           python -m pip install -e .
           python -m pip install  \
-            pytest-cov pytest-timeout pytest-xdist
+            pytest-timeout pytest-xdist
       - name: Gusto tests
         run: |
           . /home/firedrake/firedrake/bin/activate
-          which firedrake-clean
+          export PYOP2_CFLAGS='-O0'
           python -m pytest \
             -n 12 --dist worksteal \
             --durations=100 \
-            --cov gusto \
+            --timeout=3600 \
+            --timeout-method=thread \
+            -o faulthandler_timeout=3660 \
             -v unit-tests integration-tests examples